Sigma Telephoto 70mm f/2.8 EX DG Macro Autofocus Lens for Pentax AF

The Sigma 70mm focal length gives an equivalent field of view to our popular 105mm macro lens when used on digital SLR cameras with an APS-C size image sensor. The design of this lens makes it suitable for taking pictures in all situations both with natural light conditions or flash. An easy to use 70mm medium telephoto macro lens This lens has an equivalent field of view of a 105mm telephoto macro lens when used on digital SLR cameras with an APS-C size image sensor. The narrow angle of view is a great aid for simplifying backgrounds and the shallow depth of field aids composition. The greater working distance of this lens is very advantageous when taking pictures of flowers (sentence duplicated) among moving branches or highly sensitive insects. Compensate for color aberration A Special Low Dispersion (SLD) lens and two high refractive index SLD lenses provide excellent correction for all types of aberration- and produce an exceptional level of optical performance. Reduce Ghosting and Flare Sigma's super multi-layer lens coating reduces flare and ghosting, and helps create a natural color balance. Floating Focus System The floating focus system provides extremely high optical performance from infinity to 1:1 Macro. Focus Limiter Switch A Focus Limiter Switch is incorporated in the lens, improving the speed and accuracy of autofocus by limiting the focus range between 25.7cm to 48cm and 55cm to infinity. A screw-in lens hood A screw-in lens hood is included for convenient use of circular polarizing filters. A screw-in lens hood (LH620-01) is included and is designed to accept a 77mm lens front cap. Magnification scale A magnification scale is displayed on the lens barrel, ensuring ease of use.&ref=Become